20 completely edentulous patients with maxillary tori will be recruited for the study. The oral stereognosis will be evaluated by oral stereognostic test which employs manipulation and identification 6 different test pieces when placed in the patients mouth.

20 completely edentulous patients without maxillary tori will serve as control group for the study. The oral stereognosis will be evaluated by oral stereognostic test which employs manipulation and identification 6 different test pieces when placed in the patients mouth.

Six test pieces were selected from the 20 shapes of test pieces from National Institute of Dental Research. The test pieces comprises of 6 shaped forms which include circle, plus, square, rectangular, triangle and toroid shaped. A 2mm stainless steel wire was bent forming the test piece shape following the standard dimensions (13mm length and 2mm thickness)as described by National Institute of Dental Research to serve as the test pieces mould. Using the six test piece moulds, light cured acrylic resin test samples were fabricated. The test samples were trimmed and polished to meet the standardized measurements. A total of 240 test sample (6 samples for each patient) for 20 completely edentulous patients with maxillary tori and 20 completely edentulous patients without tori were made for the study. The test pieces were attached to dental floss to prevent any accidentally aspiration during the study.

Oral stereognosis test will be performed using test pieces will be placed intraorally and patients will be instructed to identify the shape of test pieces with their tongue and palate. A visual representation chart of all 6 shaped forms will be provided to patient for identification purpose. Patients will be asked to identify the correct shape form by pointing out on the corresponding shape form on the chart. The 6 test pieces will be presented randomly to the patients and correct answer will not be informed to the patients during the OSA. The duration time for recognition of each shaped form for each patient will be noted and answers will be recorded on an OSA evaluation form. A correct answer will recorded as one point and incorrect answer is zero point. A full 6 points will be scored if all answers were correct. The response time and the OSA scores will be recorded.